v3.1.1

Released to beta on Google Play on June 27, 2018. Started rollout to production on July 2, 2018.

versionCode 30

Enhancements:

• #159 - Warn user before clearing assist data
• Change QZSS "LEX" to "L6" (#154)

Bug fixes:

• Fix #153 - Use C/N0 range on meter if avg SNR > max SNR values
• Fix #155 and Fix #157 - Dynamically scale avg C/N0 meter and ticks (#158)
• Fix #152 - Use PNG instead of XML drawable for gradient on API < 24